we know that the simple form of the metric in the special relativity is like this: $ds^2 = dr^2 - (cdt)^2$ that in this metric $dr^2 = dx^2 + dy^2 + dz^2 .$ I want to ask why we minus the time sentence? I know the mathematical reasons but I wanna know what happens in nature and reality by minus of the time sentence.
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There are no mathematical reasons for a particular metric. Mathematics allows all kinds of metrics. So what do you mean when you say you "know the mathematical reasons"? – May 29 '20 at 16:10
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Target is not about the math totally.goal is about understanding why we have imaginary time and minus the time sentence from other sums – Amirhossein Taebi May 29 '20 at 16:11
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Related: https://physics.stackexchange.com/q/107443/2451 , https://physics.stackexchange.com/q/304799/2451 and links therein. – Qmechanic May 29 '20 at 16:12
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It is really helpful.thank you. – Amirhossein Taebi May 29 '20 at 16:14